One day, over the radio - an ancient technology of the 19th century but still being used by the survivors - they received an announcement from a strange radio station, claiming to be the Earth Revolutionary Alliance - temporarily called “The Resistance”. Through remote sensing satellite images and aerial photographs taken from the high ground, they say that there are lands that are safe, resource-rich, spacious, with clean water and relatively stable weather. However, for some unknown reasons, zombies tended to avoid these lands. This is not because of the mint grass smell they knew, but perhaps because of radiation or something special about the magnetic field from the ground. If these lands can be reached, then humanity can begin to rebuild settlements and grow again in the long term. The most difficult thing is: Zombies are not here, but they are very concentrated in the perimeter surrounding these lands, almost like there is an invisible force keeping them out.